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post Jul 6, 2004 - 2:26 PM
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dstrbcelica



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i just got a set of 17's and i've heard that you have to get your speedo adjusted. where do you go to have this taken care of and is it possible that i can do it myself?

-Jeff


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post Jul 6, 2004 - 5:05 PM
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jgreening

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Actually, the answer is "it depends". The key is not the size of the rim but the overall size of the rim and tire combined. For instance, a 205/55/15 tire will be the nearly identical in outside circumfrance as a 205/45/17. Thus, no change is the speedo is needed when going from 15" to 17" wheels. On the other hand, if you use 225/45/17 wheels, the speedo will be 4.1% too slow. Try a search on "miata" and you will find a tire size calculator to help you out.


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QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback]

i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this.

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